PKGBUILD/pkg/sensor/bme280.go

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package sensor
import (
"context"
"fmt"
"log"
"sync"
"time"
"github.com/d2r2/go-bsbmp"
"github.com/d2r2/go-i2c"
"github.com/d2r2/go-logger"
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"github.com/go-flucky/flucky/pkg/internal/format"
"github.com/go-flucky/flucky/pkg/types"
uuid "github.com/satori/go.uuid"
)
// BME280 is a sensor to measure humidity and temperature.
type BME280 struct {
*types.Sensor
}
func (s *BME280) ID() string {
return s.SensorID
}
// Read measured values
func (s *BME280) Read() ([]*types.MeasuredValue, error) {
// Create new connection to i2c-bus on 1 line with address 0x76.
// Use i2cdetect utility to find device address over the i2c-bus
i2c, err := i2c.NewI2C(*s.I2CAddress, *s.I2CBus)
if err != nil {
log.Fatal(err)
}
defer i2c.Close()
logger.ChangePackageLogLevel("i2c", logger.InfoLevel)
sensor, err := bsbmp.NewBMP(bsbmp.BME280, i2c)
if err != nil {
log.Fatal(err)
}
logger.ChangePackageLogLevel("bsbmp", logger.InfoLevel)
temperatureValue, err := sensor.ReadTemperatureC(bsbmp.ACCURACY_STANDARD)
if err != nil {
log.Fatal(err)
}
pressureValue, err := sensor.ReadPressurePa(bsbmp.ACCURACY_STANDARD)
if err != nil {
log.Fatal(err)
}
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// pressureValueRound := math.Round(float64(pressureValue)/10*0.25) * 10 / 0.25
_, humidityValue, err := sensor.ReadHumidityRH(bsbmp.ACCURACY_STANDARD)
if err != nil {
log.Fatal(err)
}
measuredValues := []*types.MeasuredValue{
&types.MeasuredValue{
ID: uuid.NewV4().String(),
Value: float64(humidityValue),
ValueType: types.MeasuredValueTypeHumidity,
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FromDate: format.FormatedTime(),
TillDate: format.FormatedTime(),
SensorID: s.SensorID,
},
&types.MeasuredValue{
ID: uuid.NewV4().String(),
Value: float64(pressureValue),
ValueType: types.MeasuredValueTypePressure,
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FromDate: format.FormatedTime(),
TillDate: format.FormatedTime(),
SensorID: s.SensorID,
},
&types.MeasuredValue{
ID: uuid.NewV4().String(),
Value: float64(temperatureValue),
ValueType: types.MeasuredValueTypeTemperature,
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FromDate: format.FormatedTime(),
TillDate: format.FormatedTime(),
SensorID: s.SensorID,
},
}
return measuredValues, nil
}
// ReadChannel reads the measured values from the sensor and writes them to a
// channel.
func (s *BME280) ReadChannel(measuredValueChannel chan<- *types.MeasuredValue, errorChannel chan<- error, wg *sync.WaitGroup) {
if wg != nil {
defer wg.Done()
}
measuredValues, err := s.Read()
if err != nil {
errorChannel <- err
return
}
for _, measuredValue := range measuredValues {
measuredValueChannel <- measuredValue
}
}
// ReadContinously reads the measured values continously from the sensor and
// writes them to a channel.
func (s *BME280) ReadContinously(ctx context.Context, measuredValueChannel chan<- *types.MeasuredValue, errorChannel chan<- error) {
for {
select {
case <-ctx.Done():
errorChannel <- fmt.Errorf("%v: Context closed: %v", s.SensorName, ctx.Err())
return
default:
s.ReadChannel(measuredValueChannel, errorChannel, nil)
}
}
}
// Ticker returns a new ticker, which tick every when the sensor should be read
func (s *BME280) Ticker() *time.Ticker {
duration, err := time.ParseDuration(s.TickDuration)
if err != nil {
duration = time.Minute
}
return time.NewTicker(duration)
}